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24² = 26² - (r₁ - r₂)²
(r₁ - r₂)² = 26² - 24²
(r₁-r₂)² = 676 - 576
(r₁-r₂)² = 100
r₁-r₂ = √100
= 10 cm
(R-r)²= p²- d²
= 26²-24²
= 676 - 576
R-r = √100
= 10 cm